Add option to disable strict X509 verification

[Vishwa0223]

Description

Add a synchronous client option to disable strict X509 certificate verification.

Changes

• Added disable_strict_ssl_verification to the synchronous Configuration.
• Created an SSL context when the option is enabled.
• Disabled ssl.VERIFY_X509_STRICT on that context.
• Passed the SSL context to the urllib3 PoolManager.
• Added a test for the new option.

Testing

python -m pytest kubernetes/test/test_api_client.py -k disable_strict_ssl_verification -v

1 passed, 12 deselected

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This pull-request has been approved by: Vishwa0223
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[Vishwa0223]

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